Tektronix MTG100 - Manual (Page 151)

Adding Jitter to PCRs (MTG300 only)
3Ć92
MTG100 & MTG300 MPEG Generator User Manual
Time
Period variation after jitter is applied.
Number of packets (time)
PCR Interval: 30 ms
Pattern: Square
Amplitude: 10 ms
Period: 8 [Packets]
Figure 3Ć33: Changing the PCR interval in the Deviation mode
Value Jitter Function
The Value Jitter function, accessed through the PCR Stress dialog box (see
Figure 3-31), allows you to add jitter to the program_clock_reference_base value
and the program_clock_reference_extension value in the adaptation field of
transport stream packets. You can use this function to modulate the data values
of the PCRs away from their correct values. Refer to PCR Stress Dialog Box on
page 3-51 for information about the dialog box parameters.
Figure 3-34 shows the relationship among these parameters and how the PCR
values (program_clock_reference_base value and program_clock_reference_ex-
tension) change when Sine is selected as a jitter-pattern waveform. The PCR
values varies by the value of sine waveform defined by the amplitude and period.
The PCR period does not change.
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